All of the suggestions above are good and I think that combining them would be even more interesting. For example, Seranne witholds a piece of important information from Taria because Taria's a notorious gossip and Seranne doesn't want that piece of information spread aroundthe marketplace. Then Taria makes a huge mistake that endangers them both because Seranne didn't tell her what she needed to know. That could be a combination of #1 and #3, epsecially if Taria's tendency to gossip too much and Seranne's reticence had been established earlier in the narrative.
2 and 4 could also make an explosive combination since different people will different views on what to do in a completely new situation. I'm definitely planning to use them both in the novel I'm working on right now. The result should be interesting.